The hottest interpretation of the limit of harmful

Interpretation of the line mark of the limit of harmful substances in building waterproof coatings

waterproof coatings and waterproof coiled materials are two kinds of waterproof materials widely used in waterproof engineering. Waterproof coatings are widely used in roof, toilet, underground and other waterproofing, but bisphenol A, the raw material of bisphenol a epoxy resin with a market share of more than 85%, completely depends on petrochemical resources; At the same time, bisphenol A poses a great threat to the health of life. In recent ten years, it has been extended to functional waterproof fields such as bridges, tunnels, subways, water conservancy, reservoirs, sewage treatment, etc

its excellent waterproof performance, easy construction and other characteristics make it favored by the engineering community. However, during the production of waterproof coatings, some enterprises use tar and other toxic substances as solvents, and a large amount of harmful substances volatilize during the production and construction process, resulting in the poisoning and death of workers every year, which not only seriously pollutes the environment, but also endangers the health of production and construction personnel

there are no judgment standards and applicable determination methods for "non tar" and "green environmental protection" waterproof coatings currently sold on the market. In the waterproof coating market, mud and sand are mixed, good and bad are intermingled, and it is difficult to distinguish the true from the false. It is urgent to formulate the national unified industrial standard "limit of harmful substances in building waterproof coating"

recently, the National Technical Committee for standardization of lightweight and decorative building materials held an industry review meeting on the limit of harmful substances in building waterproof coatings. The meeting reviewed and approved the standard. Building plastic materials need to make progress in technology, and it is recommended to report to the national development and Reform Commission for approval, promulgation and implementation as soon as possible. In order to formulate the industrial standard of "limit of harmful substances in building waterproof coatings", the unit responsible for drafting the standard?? The Suzhou waterproof materials research and Design Institute of China National Chemical Construction Corporation and the technical supervision and research center of building materials industry organized domestic well-known scientific research institutes, quality inspection institutions, China building materials inspection and Certification Center, Beijing General Academy of building materials science, Shanghai Academy of Building Sciences, and Shenzhen Academy of Building Sciences to widely collect different types of waterproof coatings in production enterprises and waterproof markets nationwide, Three systematic tests were carried out to determine the technical indicators and applicable test methods in the industrial standard "limits of harmful substances in building waterproof coatings"

in the process of test verification, it is found that the test results of some technical indicators of the same sample in different laboratories vary greatly. In order to reduce the test error of the laboratory, improve the reproducibility of the test method, and make the test results accurately reflect the content of harmful substances in the waterproof coating, the scientific research institutes and quality inspection institutions participating in the test verification have held meetings for many times to analyze and study the test results, find out the reasons, list them one by one, compare them with each other, and find out the differences from sampling, storage time and preparation to test conditions, operation details, calculation of test results, etc, Achieve unity, so that the five units participating in the test verification are as consistent as possible in test methods, so as to ensure the accuracy and comparability of test results and provide a reliable scientific basis for standard formulation

the formulation of the industrial standard "limit of harmful substances in building waterproof coatings" is a scientific and technological achievement made by scientific research institutions, quality inspection institutions and a survey from the China flame retardant society. Six domestic scientific research institutions and quality inspection institutions participated in the drafting and undertook the task of experimental research. 11 domestic well-known waterproof coating enterprises including Guangdong Keshun, Shanghai tunnel, shikewei, Beijing Donghai, Dongfang Yuhong participated in the drafting

BASF (China) also actively participated in the drafting of the standard. In the industry standard of "limit of harmful substances in building waterproof coatings", which has been reviewed and passed, it is stipulated that the standard "is applicable to the comprehensive inspection of quality! Auxiliary materials for building waterproof coatings and waterproof materials"

the waterproof coating is divided into Grade A and grade B according to the content of harmful substances. Class A is environmental protection waterproof paint; As the threshold for waterproof coating to enter the market, grade B content is the minimum requirement that waterproof coating must meet

according to the properties of building waterproof coatings, they are divided into three types: water-based, reactive and solvent based waterproof coatings. Water based and reactive waterproof coatings are divided into two levels a and B according to the content of harmful substances, and solvent based waterproof coatings are only level B

note: the reprinted content is indicated with the source. The reprint is for the purpose of transmitting more information, and does not mean to agree with its views or confirm the authenticity of its content